Revert "use PEP621 metadata to define license file to copy to wheel"

This reverts commit cd8b4d0.

embedding the full LICENSE text file as a multi-line RFC5322 text breaks
in unexpected ways on Windows, I get double CRLF line endings which lead
to twine check fail to validate the README section that follows the
LICENSE...

Let's revert to adding the license file using wheeltools for the time
being.

build.py

@@ -6,6 +6,7 @@
 import subprocess
 import sys
 from pathlib import Path
+from wheeltools import InWheel
 
 
 root_dir = Path(__file__).parent.resolve()
@@ -37,10 +38,18 @@ def main():
     except (IndexError, KeyError):
         sys.exit("usage: build.py [sdist|wheel]")
 
-    return subprocess.call(
-        cmd + ["-o", str(dist_dir)] + sys.argv[2:], cwd=str(crate_dir)
+    subprocess.run(
+        cmd + ["-o", str(dist_dir)] + sys.argv[2:], check=True, cwd=str(crate_dir)
     )
 
+    # maturin doesn't add the license text to the wheel archive yet so we
+    # have to do it ourselves: cf. https://github.com/PyO3/maturin/issues/829
+    for wheel_file in dist_dir.glob("pngquant*.whl"):
+        with InWheel(in_wheel=str(wheel_file), out_wheel=str(wheel_file)) as tmpdir:
+            distinfo = next(Path(tmpdir).glob("*.dist-info"))
+            assert distinfo.is_dir()
+            shutil.copyfile(crate_dir / "COPYRIGHT", distinfo / "LICENSE")
+
 
 if __name__ == "__main__":
     sys.exit(main())

pyproject.toml

@@ -16,7 +16,6 @@ name = "pngquant-cli"
 version = "2.17.0.post3"
 description = "Precompiled binaries for pngquant, the lossy PNG compressor based on libimagequant."
 maintainers = [{name = "Cosimo Lupo", email = "cosimo@anthrotype.com"}]
-license = {file = "COPYRIGHT"}
 
 [project.urls]
 repository = "https://github.com/anthrotype/pngquant-wheels"

requirements.txt

@@ -2,3 +2,4 @@ maturin
 tomli
 tomli-w
 twine
+wheeltools